B
| Town name | Postal code |
| Bakone | 0746 |
| Bakone | 0757 |
| Balfour | 2410 |
| Bamokgoko | 0432 |
| Barberton | 1303 |
| Barberton | 1307 |
| Barberton | 1309 |
| Barberton | 1300 |
| Barkly East | 9786 |
| Barkly East | 9787 |
| Barkly West | 8375 |
| Barkly West | 8376 |
| Barkly West | 8377 |
| Bathurst | 6166 |
| Beaconsfield | 8315 |
| Beaufort Wes | 6970 |
| Beaufort West | 6973 |
| Beaufort West | 6940 |
| Beaufort West | 6950 |
| Beaufort West | 6970 |
| Beaufort-Wes | 6970 |
| Bedford | 5780 |
| Bedfordview | 2007 |
| Bedworth Park | 1940 |
| Bekkersdal | 1779 |
| Bekkersdal | 1782 |
| Belfast | 1301 |
| Belfast | 1192 |
| Belfast | 1193 |
| Belfast | 1194 |
| Belfast | 1100 |
| Belfast | 1101 |
| Belfast | 1102 |
| Belfast | 1121 |
| Belfast | 1130 |
| Belfast | 1151 |
| Belfast | 1152 |
| Belfast | 1153 |
| Belhar | 7493 |
| Belhar | 7504 |
| Bellville | 7530 |
| Bellville | 7532 |
| Bellville | 7533 |
| Bellville | 7536 |
| Bellville | 7537 |
| Bellville | 7538 |
| Bellville | 7539 |
| Bellville | 7540 |
| Benoni | 1501 |
| Benoni | 1502 |
| Benoni | 1503 |
| Benoni | 1504 |
| Benoni | 1505 |
| Benoni | 1506 |
| Benoni | 1507 |
| Benoni | 1508 |
| Benoni | 1509 |
| Benoni | 1511 |
| Benoni | 1514 |
| Benoni | 1515 |
| Benoni | 1516 |
| Benoni | 1517 |
| Benoni | 1518 |
| Benoni | 1520 |
| Benoni | 1522 |
| Benoni | 1524 |
| Benoni | 1525 |
| Benoni | 1526 |
| Benoni | 1527 |
| Bergville | 3350 |
| Bergville | 3351 |
| Bergville | 3352 |
| Bergville | 3354 |
| Bergvliet | 7945 |
| Bethal | 2309 |
| Bethal | 2311 |
| Bethal | 2312 |
| Bethal | 2320 |
| Bethelsdorp | 6028 |
| Bethlehem | 9700 |
| Bethlehem | 9701 |
| Bethlehem | 9702 |
| Bethlehem | 9703 |
| Bethlehem | 9704 |
| Bethlehem | 9705 |
| Bethlehem | 9706 |
| Bethulie | 9992 |
| Bisho | 5605 |
| Bisho | 5606 |
| Bisho | 5608 |
| Bisho | 5620 |
| Bisho | 5671 |
| Bitterfontein | 8201 |
| Bitterfontein | 8202 |
| Bitterfontein | 8204 |
| Bitterfontein | 8205 |
| Bizana | 4800 |
| Bizana | 4802 |
| Bizana | 4803 |
| Bizana | 4804 |
| Blackheath | 7580 |
| Blinkpan | 2250 |
| Bloemfontein | 9364 |
| Bloemfontein | 9380 |
| Bloemfontein | 9928 |
| Bloemfontein | 9781 |
| Bloemfontein | 9300 |
| Bloemfontein | 9301 |
| Bloemfontein | 9302 |
| Bloemfontein | 9303 |
| Bloemfontein | 9305 |
| Bloemfontein | 9306 |
| Bloemfontein | 9307 |
| Bloemfontein | 9309 |
| Bloemfontein | 9310 |
| Bloemfontein | 9311 |
| Bloemfontein | 9312 |
| Bloemfontein | 9313 |
| Bloemfontein | 9315 |
| Bloemfontein | 9317 |
| Bloemfontein | 9320 |
| Bloemfontein | 9321 |
| Bloemfontein | 9322 |
| Bloemfontein | 9323 |
| Bloemfontein | 9324 |
| Bloemfontein | 9325 |
| Bloemfontein | 9326 |
| Bloemfontein | 9327 |
| Bloemfontein | 9330 |
| Bloemfontein | 9332 |
| Bloemfontein | 9334 |
| Bloemfontein | 9356 |
| Bloemfontein | 9358 |
| Bloemfontein | 9360 |
| Bloemhof | 2660 |
| Bloemhof | 2661 |
| Bloemhof | 2662 |
| Bloemspruit | 9364 |
| Blood River | 3024 |
| Bloubergrant | 7441 |
| Bloubergrant | 7444 |
| Bloubergrant | 7449 |
| Bloubergstrand | 7441 |
| Bluff | 4052 |
| Bluff | 4139 |
| Bochum | 0790 |
| Bochum | 0807 |
| Bochum | 0828 |
| Bochum | 0849 |
| Bochum | 0626 |
| Bochum | 0718 |
| Bohlokong | 9702 |
| Boitekong | 0308 |
| Boksburg | 1446 |
| Boksburg | 1459 |
| Boksburg | 1460 |
| Boksburg | 1461 |
| Boksburg | 1462 |
| Boksburg | 1463 |
| Boksburg | 1464 |
| Boksburg | 1465 |
| Boksburg | 1466 |
| Boksburg | 1467 |
| Boksburg | 1469 |
| Boksburg | 1470 |
| Boksburg | 1471 |
| Boksburg | 1472 |
| Boksburg | 1474 |
| Boksburg | 1477 |
| Boksburg | 1478 |
| Boksburg | 1479 |
| Boksburg | 1482 |
| Boksburg | 1485 |
| Boleu | 0474 |
| Bonnievale | 6730 |
| Bonnievale | 6741 |
| Boordfontein | 0182 |
| Boordfontein | 0201 |
| Boordfontein West | 0182 |
| Boordfontein West | 0201 |
| Boordfontein-Wes | 0201 |
| Boordfontein-Wes | 0182 |
| Bosbokrand | 1286 |
| Boshof | 8340 |
| Boskop | 2528 |
| Botha’S Hill | 3660 |
| Bothaville | 9660 |
| Bothaville | 9661 |
| Bothaville | 9663 |
| Botshabelo | 9782 |
| Botshabelo | 9785 |
| Botshabelo | 9781 |
| Botshabelo | 9788 |
| Botshabelo | 9789 |
| Boyne | 0727 |
| Boyne | 0728 |
| Boyne | 0764 |
| Boyne | 0766 |
| Brackenfell | 7560 |
| Brakpan | 1541 |
| Brakpan | 1542 |
| Brakpan | 1543 |
| Brakpan | 1544 |
| Brakpan | 1540 |
| Brakpan | 1545 |
| Brakpan | 1546 |
| Brakpan | 1547 |
| Brakpan | 1548 |
| Brakpan | 1549 |
| Brakpan | 1550 |
| Brakpan | 1552 |
| Brakpan | 1553 |
| Brakpan | 1554 |
| Brakpan North | 1541 |
| Brakpan North | 1545 |
| Bramley | 2054 |
| Bramley | 2066 |
| Bramley | 2073 |
| Bramley | 2090 |
| Bramley | 2144 |
| Bramley | 2148 |
| Brandfort | 9400 |
| Bredasdorp | 7281 |
| Bredasdorp | 7282 |
| Bredasdorp | 7283 |
| Bredasdorp | 7285 |
| Bredasdorp | 7287 |
| Breyten | 2330 |
| Brits | 0189 |
| Brits | 0210 |
| Brits | 0217 |
| Brits | 0220 |
| Brits | 0232 |
| Brits | 0240 |
| Brits | 0250 |
| Brits | 0251 |
| Brits | 0252 |
| Brits | 0253 |
| Brits | 0255 |
| Brits | 0257 |
| Brits | 0258 |
| Brits | 0259 |
| Brits | 0260 |
| Brits | 0261 |
| Brits | 0264 |
| Brits | 0265 |
| Brits | 0267 |
| Brits | 0268 |
| Brits | 0269 |
| Brits | 0270 |
| Brits | 0271 |
| Brits | 0273 |
| Brits | 0274 |
| Brits | 0275 |
| Brits | 0276 |
| Brits | 0277 |
| Britstown | 8782 |
| Bromhof | 2154 |
| Bromhof | 2188 |
| Bronkhorstspruit | 1020 |
| Bronkhorstspruit | 1021 |
| Bronkhorstspruit | 1022 |
| Bronkhorstspruit | 1024 |
| Bronkhorstspruit | 1025 |
| Bronkhorstspruit | 1026 |
| Bronkhorstspruit | 1027 |
| Bronkhorstspruit | 1028 |
| Bryanston | 2189 |
| Bryanston | 2191 |
| Bryanston | 2196 |
| Bryanston | 2165 |
| Bryanston | 2152 |
| Bryanston | 2128 |
| Bryanston | 2077 |
| Bryanston | 2069 |
| Bryanston | 2072 |
| Bryanston | 2055 |
| Bryanston | 2056 |
| Bryanston | 2057 |
| Bryanston | 2060 |
| Bryanston | 2021 |
| Bryanston | 2031 |
| Bryanston | 2052 |
| Bultfontein | 9670 |
| Bulwer | 3244 |
| Burgersdorp | 9744 |
| Burgersfort | 1085 |
| Burgersfort | 1160 |
| Bushbuckridge | 1255 |
| Bushbuckridge | 1282 |
| Bushbuckridge | 1283 |
| Bushbuckridge | 1284 |
| Bushbuckridge | 1285 |
| Butterworth | 4960 |
| Butterworth | 4961 |
| Butterworth | 4963 |
| Butterworth | 4968 |
| Butterworth | 5013 |
